$basket = \Bitrix\Sale\Internals\BasketTable::getList(array(
    'select' => ["*", "PROPS.CODE", "PROPS.VALUE"],
    'filter' => ['FUSER_ID' => \Bitrix\Sale\Fuser::getId(), "ORDER_ID" => 'null'],
    'runtime' => [
        new \Bitrix\Main\ORM\Fields\Relations\OneToMany(
            'PROPS',
            '\Bitrix\Sale\Internals\BasketPropertyTable',
            'BASKET'
        ),
    ]
))->fetchCollection();
foreach($basket as $itemObj) {
    $arItem = $item->collectValues();
    /**
     * @var $obPropsCollection \Bitrix\Main\ORM\Objectify\Collection - коллекция всех свойств
     */
    if ($obPropsCollection = $itemObj->get("PROPS")->getAll()) {
        foreach ($obPropsCollection as $propObj) {
            $arItem["PROPS"][$propObj->getCode()] = $propObj->collectValues();
        }
    }
    $basketItems[$PRODUCT_ID][$arItem["ID"]] = $arItem;
}