$query = $db->getQuery(true)
->select($db->quoteName('legingsdag'))
->from($db->quoteName('#__containerwissel_wisseldag'))
->where($db->quoteName('route') . ' = ' . $route)
->where($db->quoteName('legingsdag') . ' > "' . $vandaag . '"')
->order($db->quoteName('legingsdag') . ' ASC');
$query->setLimit(1);
$query = $db->getQuery(true)
->select($db->quoteName('legingsdag'))
->from($db->quoteName('#__containerwissel_wisseldag'))
->where($db->quoteName('route') . ' = ' . $route)
->where($db->quoteName('legingsdag') . ' > "' . $vandaag . '"')
->order($db->quoteName('legingsdag') . ' ASC')
->setLimit(1);
echo (string)$query;
SELECT `legingsdag` FROM `#__containerwissel_wisseldag` WHERE `route` = 6 AND `legingsdag` > "2017-07-26" ORDER BY `legingsdag` ASC