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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfaf4a35f39bf0ab3a3bcfea24119c62d6c4a525bcdc0c10be8e45b7a43f0e99' 
  AND token = 'bGnWq9S9gPDJFMc3TMLP09+c1a0Da8LPwunexYmWMw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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