You'll have to provide a lot more information to get a meaningful answer.
I haven't found any issues with spatial queries on 10.2.0.5.
- Can you supply us your SQL query, preferably with an execution plan?
- How many rows in the table?
- How many rows does the query return?
- Is the data in a projected coordinate system or not?
- What do you mean by Export/Import and what is different about the query run at that stage?