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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d38de557b9c7536fc27cdc6d31344fcad30d7f2c93e364a825bc77cfa681a7d' 
  AND token = '8TSglKvxIuBSrknnDuZkzSgf9BrA8KpjqQNARcsvsTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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