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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c82c8c4888efa2d55cc736a487301a3691471d8fe49cd0b7040526de1eb57ed4' 
  AND token = 'Op5L4CM/TIw6LL4g12GH+1GrBVQxNdkz+USNvyPm/y8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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