SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18c2307be48e93e763f1d903c4ec544c6b9ab0c8abbf84f59bc9246574367779' 
  AND token = 'QmUnc8uQnr2HO+ARDzoZvRVxJjCruu3/33VYWlSwroE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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