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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ace3437751139b7e23f52a395389d338ad772965254531b3ab7b3cf651bc8926' 
  AND token = 'uuJSr8VxIrWS9Gj7YBxJTW1Er4cMfrQRZdFKns1n3+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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