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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db7034a6195230ae803c64a4b770673e0e58c0b7bf150ae75ef1691e780dbe88' 
  AND token = 'zlMWswcpz1REIOScfRTgJ9fmRED0/+XtbSeFFOE8+Zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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