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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '957cdc4627d28a4a48351c96f65e6bb67d8d59ca83928d9b970a3e625630dffc' 
  AND token = 'sfMUBHzk2HPyW0+5Koa7vIxDjHe/e+somc/qQDXECds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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