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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '944cc07c84cbcc4b1ede413734cf043f4ba76da0a32ea5a557d7012607594033' 
  AND token = 'SJn9nhBhG07rImXZeenYe8YWmmoBnOKSq8vFMq4E24E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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