SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '002d771f351eea51b6c84c8950f27ad25028ca17f43bc211ab3c54d3bb50bddf' 
  AND token = 'BzZwio1j95qdBkYFChG5QTNUpHplKGB0AgE/ZbRjW5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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