You can use the following JQL to find that issue:
summary ~ "XX_54_GCSE1234_TEST"
Since the Summary (issue title) field uses a "like" search (ex: "~") you can also search for part of the string you provided. Example:
summary ~ "XX*"
summary ~ "TEST"
The fuzzy search doesn't always return what you want though, so you'll have to play with it if the above doesn't help. I don't know much about the logic when special characters are present. Maybe someone else in the Community can comment further.
Also, you can't use "=" with the Summary field.
Hope this helps,
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