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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f87bba4ccf202d850dde00b72f6763eb2dcb9eaf4be569f56fe820899ea4b3f' 
  AND token = '/ATOfBMkSr7MFOE5rgfi1XiIVJ8s4jU0hTilYH5Xlgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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