Db::findByUid() 

\nn\t3::Db()->findByUid($table = '', $uid = NULL, $ignoreEnableFields = false); 

Finds an entry based on the UID. Also works if the frontend has not yet been initialized, e.g. while AuthentificationService is running or in the scheduler.

\nn\t3::Db()->findByUid('fe_user', 12);
\nn\t3::Db()->findByUid('fe_user', 12, true);

public function findByUid( $table = '', $uid = null, $ignoreEnableFields = false )
{
	$rows = $this->findByValues( $table, ['uid' => $uid], false, $ignoreEnableFields );
	return $rows ? array_shift($rows) : [];
}