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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2402963fdd1da2ce36742a7621c6b6a748db257772c643543a6776ac63a8293' 
  AND token = '7xEyNoFzk7V2sXVsP+WxjRVFoGe0ujTSixJq0yyjV94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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