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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17813f9354a368ec982b19d43ec1525e5f8a6f84dd65e65e4615c076374aed97' 
  AND token = '5DwFswgdRELpeMU/PsQFL3wukzqa2eOftQ2BH8Cy3p0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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