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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '518f997b7d425662afb47290179ed9c46cf46b6a7f8c4ca0413115558d13ac86' 
  AND token = '+aLhcjFrlieLZ1WlZkVTCpeic7vxSVsBnwecw5zkcGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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