Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '999a308777997cac0607d128cbc158a844cdd98201dc6eb4333f6263df79195e' 
  AND token = 'xlKQHBPCDStBm3N64LHpZdrV33NHxQ/EquVVgSN91NE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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