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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f1d2a9defc77c4e5f30e0a028c3e96b5fd767aa91a8601c8c9d790429b0984b' 
  AND token = 'kekoEs7SzHFChR9Ioqjh1DAb2aWKzvpsDrehttEJmZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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