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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '688b57881162c11b1ceea75fe68fc443cd15a2f39ce8d671014e665c7a7e8a5f' 
  AND token = 'sYix8fvtvI9uoDibieIf+ot1x9ftP1bvHr1M6Kigcvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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