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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9beec17e1a868fdbdede1b2892c2bcf449a68c0d86ad6be6103b215ed7e95f34' 
  AND token = 'Tvhb9swKnGu7XvcIjU0oRK55LgORb4RhOkC8o+RNxXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}