Search for * (star) character using CONTAINS()

Consider the following example:

create column table test_text (some_text text);

insert into test_text values ('ABC');
insert into test_text values ('*');

What I would like to get is only the second line, where text is '*'.

I tried:

-- Returns both rows
select *
from test_text where
CONTAINS(some_text,'*', EXACT);

-- Tried to escape the character, no result
select *
from test_text where
CONTAINS(some_text,'\*', EXACT);

 -- ASCII code for *, two rows again
select *
from test_text where
CONTAINS(some_text,char(42), EXACT);

As you see, I couldn't find a way in HANA to select a row where text contains star character.

Any solution you could suggest?