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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79a8827e5eddcb259c4f3beb26042290eea1c83c2e2e6bf0947c9dced01e78e6' 
  AND token = '1vq9B9pvaG9z+v+nM3GFhpTnj9caP69TTGbn9mqTGSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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