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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95be9773a6c8a1c3030b32d7ea5f213543d16a6f7391d5b221ad904dd7fb2c3a' 
  AND token = '3ifxmf1ESeLQN5RkKvjIPQTSnlRLQT6I32GTEeHgcnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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