/**
* @param $userId
* @param $tokenString
* @return AccessToken|null
*/
protected function findAccessToken($userId, $tokenString)
{
$qb = $this->accessTokenRepository->createQueryBuilder('a');
$query = $qb->select()->innerJoin('a.user', 'u', 'WITH', 'u.id = :user_id')->where('a.token = :token_string')->setParameter('user_id', $userId)->setParameter('token_string', $tokenString)->getQuery();
return $query->getOneOrNullResult();
}