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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f09561c3e0977d1e3eb42ff7c9afeee05acce424c9c80f14570a36a931c3517a' 
  AND token = 'kBguiH73dP50JSOfaumKkww34wgZhv5iKuaH/dKLg5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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