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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '152f3f4175fcc29b5a7c9ce6b9ffb5ced08688e32f7f0f41a9dd1293e95933c8' 
  AND token = 'oEkH20yq/yJP3FoKnbQNskLMEN38qxNjDm+Oq89vDAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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