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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88c1238cc3fc57f3d46d0005e9ba09d5430b22dd20573356744047087648940f' 
  AND token = 'PRNzw7bID0xy6MmlfyxcF6USSE4UErwBFsgLIDxq8bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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