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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d03663635b868e3ddc5b3b9e425f661a340fb9b675c87091afd2660831dd6b2' 
  AND token = 'ARaVYg19FWOFniONsFh+r+aluezcJFH7JkQiXD4P0p4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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