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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bbf64d250bb353fb08980294cf3715e5d5dc3df3c0c384527f47fcd44b54f873' 
  AND token = 'CVflKn3uz3X0qnQvX9AjTbhk5obeUEcpC4JeAzfzbdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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