SELECT 
  lang.name, 
  lang.value 
FROM 
  cscart_multi_declanguage_values lang 
WHERE 
  lang.lang_code = 'ru' 
  AND lang.name IN (
    'my_account', 'profile_details', 
    'downloads', 'orders', 'view_comparison_list', 
    'track_my_order', 'track_my_order', 
    'order_id', 'go', 'go_to_admin_panel', 
    'sign_out', 'sign_in', 'register', 
    'sign_in', 'my_account', 'profile_details', 
    'downloads', 'orders', 'view_comparison_list', 
    'track_my_order', 'track_my_order', 
    'order_id', 'go', 'go_to_admin_panel', 
    'sign_out', 'sign_in', 'register', 
    'sign_in'
  )

Query time 0.00059

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "28.81"
    },
    "table": {
      "table_name": "lang",
      "access_type": "range",
      "possible_keys": [
        "PRIMARY"
      ],
      "key": "PRIMARY",
      "used_key_parts": [
        "lang_code",
        "name"
      ],
      "key_length": "392",
      "rows_examined_per_scan": 12,
      "rows_produced_per_join": 12,
      "filtered": "100.00",
      "index_condition": "((`vishalecarter_multi_dec`.`lang`.`lang_code` = 'ru') and (`vishalecarter_multi_dec`.`lang`.`name` in ('my_account','profile_details','downloads','orders','view_comparison_list','track_my_order','track_my_order','order_id','go','go_to_admin_panel','sign_out','sign_in','register','sign_in','my_account','profile_details','downloads','orders','view_comparison_list','track_my_order','track_my_order','order_id','go','go_to_admin_panel','sign_out','sign_in','register','sign_in')))",
      "cost_info": {
        "read_cost": "26.41",
        "eval_cost": "2.40",
        "prefix_cost": "28.81",
        "data_read_per_join": "4K"
      },
      "used_columns": [
        "lang_code",
        "name",
        "value"
      ]
    }
  }
}