Simple sql search including space

Below is the sample table. Would like to get record as matching,but not getting with below tried query.
mytable
ID cat_name
100 Bathroom sinks

declare @key varchar(50) ='bathroom sink'
select * from mytable where cat_name like '%@key%'

What is the collation on the table/database?

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select * from mytable where cat_name like '%' + @key + '%'

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