Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2903db7c49d591be3ea971af31fd042e3ebf46dd919287d4550ebca64e64430e' 
  AND token = '3kzYc7ffoRstHwcRrCmNFtIjAg6jShftxfnQgllaa7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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