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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e5740fa732d07569923cb90136a4c43e04e80aee8337d580b4a8503a70438fd' 
  AND token = 'H47HfXUKdqDLXlC91kzEpE6QTj+j0sinDGZpMBz+ets=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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