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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '333261d90444889e9bb970dd336cd3aee0870fc5c851cda2cbf040731e674079' 
  AND token = '9YBbcPW2l5YSestPynx7dlLp/XF1mWIjd8ir2RvQqlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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