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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03091b94930420172b8fa1cc7daadc676b305f92f5925514a9117d657c9468ef' 
  AND token = 'EqU4/RmqPQYUdre0AgXNIW8zAnTcytXs11Jg7La+6L0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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