SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10dbdd972f8499b610a33a4d4791aadf15b3077d67f62f118e0b444c43a3b765' 
  AND token = '/OH1NYA/gBCEBDivOCRExGC/ZyZvDV5aJo3vQJ7UP1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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