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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4ac60deaa020c6d17f0980e1f543b6ddb56b2974928a4ba51f4fddcb5784e94' 
  AND token = 'QsOBsW88+S3fLKyiB+/xriaUumHDzKFiuOeowL/afZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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