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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fca18b2e79b08250df18d5501ba5eda00c76ffe2771fd3fd09ad0a893ce35a1e' 
  AND token = 'weMaVJkyywQ3NPQLXolSn8fQ6uIEsdG22WaxygvP0tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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