SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e07d324ab184c2afddf2d7ffa3cbc5f4a5eb51b43c0d079d7118993c4384586' 
  AND token = 'jLZxyFwz+kz4EhgNgGvkrp6z5YzwVlfRWiN1AnwveY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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