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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd723a834f31059fcfb3883bf3b920ced3dae445a66a67b8f5deac5d34c97cdc9' 
  AND token = 'dhzfSxYyMA23UY+iefNmwE8OaboxIJ07Tu1qMVXdiKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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