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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a958e22589e887b09749e53352fe388e441b107aee97d4f469dac4d2ed61aa92' 
  AND token = 'g93Zb0FFBwniD7cMOu7EIoB1FZv4W+u17mWWHlfy3zE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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