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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09b4c04e036bdc3eb0b029615ecd5e5984fe3681eeab09eb7ede9ae3c7108ea0' 
  AND token = 'nmuiBpkNqOvR9+nQY5adAafK4CxixhVm/3rBLXQX3Hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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