Find out this only through reading the views.module code. In case of your views block display has a long name (> 32 chars)(the views name would be used as delta in block table), Views would hash it through md5. You can get the list of hashed names stored in the variable table as views_block_hashes. For example, mine:-

Array
(
    [ba843477361f490ca5c9e42548f0127d] => imagegallery_block_latest_images-block_1
)

The related code is in line 298 of views.module.