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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6935ed1c9773551005265b717df72c253df8dc0ee708dc7496eb721748e68f28' 
  AND token = 'PeR947W+4bymRQjYXpZIxVb4SkO3wzbbxXnpkvNteC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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