Хорошая идея, но, к сожалению, не оно 
SELECT products.product_id, descr1.product as product, products.product_type, products.parent_product_id, products.master_product_id, products.company_id, products.rf_stop_update_price, products.rf_stop_update_amount, products.rf_stop_update_status, descr1.meta_keywords, descr1.meta_description, descr1.page_title, descr1.full_description, descr1.short_description, (SELECT SUM(amount) FROM cscart_products WHERE product_id = products.product_id AND company_id = 1) as geolocation_amount, 0 as geolocation_amount2 FROM cscart_products as products LEFT JOIN cscart_product_descriptions as descr1 ON descr1.product_id = products.product_id AND descr1.lang_code = ‘ru’ LEFT JOIN cscart_product_prices as prices ON prices.product_id = products.product_id AND prices.lower_limit = 1 INNER JOIN cscart_products_categories as products_categories ON products_categories.product_id = products.product_id INNER JOIN cscart_categories ON cscart_categories.category_id = products_categories.category_id WHERE 1 AND prices.usergroup_id IN (0) AND products.company_id <> 0 AND products.product_type != ‘D’ GROUP BY products.product_id ORDER BY products.product_id asc, products.product_id ASC LIMIT 0, 50:
Вот так выглядит запрос. Часть элементов в запросе - от кастомного модуля по геопозиции подлючаемого хуком, оно в данном магазине на большинстве страниц.
А долбит вот так: