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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7295ac0b313cf070733d3184194dea05bc0f8bf24d4680f7b8ca47ea6ae3c85d' 
  AND token = 'aLMkrpCS2HmZaxQK56T2DItJhqYaxdFvu/wIDFSPErY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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