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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdcaf9930ab876f8dad7b6948c15670c6ec262207d7ca4a7ab6d765c956e6443' 
  AND token = 'J0CJ1z4I6LOhhSW/4FBkIiGcvntn125b9W3AVOsMnIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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