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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a328e4a7b92e050aa571d89b68aaf59e8c8d45f0a00bf0572288fd59e82364b1' 
  AND token = 'moz8QGW7Db33fLS2362O2tOwCLlh9bkI/d3yZmq56Bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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