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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77e94820b6588b4b7a71a9414478c90808a3e234d802dbc3c1148b1a83e615aa' 
  AND token = 'NRFbbCCvZTfuQvux6Ewok+flVRZLab2PXFRGXHtUL9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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