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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b90bfafe4d59401caef77abb382c9df708e3dac5f9d0fe239ec944d09f7ae7d9' 
  AND token = '+hmEJB1lsiIrXtahYaKbprur8tw7YLPoyq44vyYp7Ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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