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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79132453f84ad8ade5d41a3dcb6b95e7cc028f1ada55fe27581867c24de36968' 
  AND token = 'n01gl2KsvclLVrEFTYnS4/dO6erWUT3ULavsehIfC6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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