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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '683235e696c41f4f536c85f7d066f8d57b9a748784cd2fa60623bd66f3324f9d' 
  AND token = 'ypHlWInALuyRrU2weXGmyXq+nrSeIEpJeTGi/4cFkws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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