protected function _query($identifier)
    {
        list(, $userAlias) = pluginSplit($this->_config['userModel']);
        $provider = $this->adapter()->id;

        return $this->_profileModel->find()
            ->where([
                $this->_profileModel->aliasField('provider') => $provider,
                $this->_profileModel->aliasField('identifier') => $identifier
            ]);
    }