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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d6bbfcd0c70d0677a61e5cc981075af3ecf5196e3440982f75557a76f218457' 
  AND token = 'VSpqxtdeyamdR2hRllF9J3SJZNl43dQUO637oBcz9LA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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