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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d1fa98ec3f978950d3f4711fa3c0045d77720de66eeeae4d97472f923e0514a' 
  AND token = '7xH3/56S7kuaMdYJyg/hwTsR5fyi0a/FEqiRYJ/FlpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}