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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c85d537582056e122caba36187e3c439ef85f4ea007919d0e300302639433032' 
  AND token = '0MOvypbbzwhDjNwwWdSHdoYICYAUs+cCU5kJeArjczg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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