How do I have dummy values for MySQL “Explain”?

Without values, it can't explain query, because it can't estimate the number of rows it needs to scan. This is not only to show the rows in the explain output, but to choose proper index - if you have index on story_id and another one on user_id, it will choose the one that selects less rows. And sometimes explain can see that where clause do not match rows at all (and will output impossible where clause).

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