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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4bbfe0ed70ed0710e7ae7e9917e2368a41a211f079ef5e194e7c71046eb18ad' 
  AND token = '2N39JQUnP+0h78h/tZHYxtZBWAznmDR3ZtXCsdqyQmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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