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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cd264310dbc920e938910064fdc9a6b656a96a59211bc7f3e24ef6f848bdeab' 
  AND token = 'a9d7t5BPES2mz4ZwIoQ8pzKKqEz2HQrm/H2Y6WjXgmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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