Hi,
"com_hikashop" is the name of the component, because we have to follow the Joomla rules ; the name of the component must be "com_hikashop".
And if you use SEF urls, you won't see any "com_hikashop" in the urls.
About the cart_type, it is not something which will used by the SEO ; in order to have a cart, you have to add products into.
Otherwise, please provide more precise details about the issue you got.
HikaShop have various optimizations for the SEO and the SEF ; so your message is surprising.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.