SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03c4dccc35e0af32244a794df86685e9db71cd2fe2373bc87c5891adb9d3f78f' 
  AND token = 'qB7wwx9mtKGqGUgonln5T6j+hPgkK1lRoIJwJAUEEOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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