select p.*, min(price) m
   from oc_product p
     join
        oc_product_option_value
     using(product_id)
   group by product_id
   order by m

select o.*, ov.price from oc_product o
join
(select product_id, min(price) as price
from oc_product_option_value ov
group by product_id)
ov on o.product_id = ov.product_id
order by ov.price