SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaf8494be6bea996fae87472a7c5c0ac5449351f899c230235e9b81004fe11a5' 
  AND token = 'QTO+g8muRBPVjHDFGrKvWxdPh3rIEuQklUzsATAyLa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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