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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83dbe3a01a009162fa615a145918f73ab7a0a117787c08f140f308f2402f0f1a' 
  AND token = 'klLG/auR4GPWVojI5nXEf6vyglrv8jVVNK8vbnF/iIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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