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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4977c8fb9ce13c6c8e3666fce4491b0f2b151689255dd6e7bbd13ef7e26c4a6d' 
  AND token = 'CxcncjL67BnTZxxOZmNnARhoTf5hdZINVw6dTKukJ+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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