Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15a00fddc184e8cafb3859eac367ca50c96ed39821689844a90620ef648f931c' 
  AND token = 'beKn+WKNOjKz3l4r9nECziVGHtTHY8zvuseYXrclADI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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