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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35a045ea908720f48c5a68262b80e9dc710e9b393941f835ae50c74ee3017eca' 
  AND token = '+3F6Hfny59nZzRe9YFGHJ0HKZb9Mfnv+UThnJyGgTHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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