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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfa5961b7966f681e25f56d62d5dcef560b528cdff569cdb20317725b0901aa4' 
  AND token = 'hZiDgxYi6v6zd/R5Nww5kiVqf6fjLWHPJLY3ui7kiAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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