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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88a4f8c4d1a8955533d8d39fab7ce01be475cdb839a7e1d29ee3a51bd4e382c9' 
  AND token = 'WotkNMMa6HSRZOE4xLE2m91V0WXhbnJ0/BmLekFWcjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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