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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fde79e6ce8c82bb5a5abe69cfb8429d887bb4ca7b4b90d73deeae60a9c6e4b77' 
  AND token = 'flBb0rAxVRYCgNhv4O8CR/iwaAYsARRN7FVhB5SWPL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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