SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf2632d5cc283b777aa4a50d5cf1bbcd180de86132c193f957b25a757b7c7bbd' 
  AND token = 'ZRY9s/bywMzprkZhqR9CZTIJQEJgDIYJl7waLGRU42w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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