SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6af0b066e7324c53a3ab58d0d061643249de743090623072c9f9cf72e2b38607' 
  AND token = '01P2zG81jd/QswGqvqnAUCRx0iVKDgwPLkpP96DiZ6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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