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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dccf4eca6bfaaa870d993aadd63fcc5d5ebfa93cb73c9dd079c2149a7ce4600d' 
  AND token = '8Ia38qmHui5MaIndmb28jMy2pTvpveGJWx1pKjqIckI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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