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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4437d4c56b501863c5e471075fc803c69f87521827e9548d6f09ffcdf5a6ad5' 
  AND token = 'aSAIRk/QH+uhEFonh2XD4FFkzXzRIQduCO8zv2nveAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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