SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f04e0b115b91927edfefb8bfb4705f83f39f5e6357dd9738793dfbcca6e01a76' 
  AND token = '2+Jjh4Oz43+PxZ+Ae2rSvKoC/qqP+H1g+PTqH0WjPjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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