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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '684d159accffb42a9fb2b9442245a68e9b342268b2f0a64b1c3789d17ece1a0d' 
  AND token = 'TqHrAnOzmL//MRifpaQEE4IjtBOt74DhU0/f5vfQgoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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