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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '520c8efb6d0e2b9db9f2ca0100c03aabdb87abc1eb1e6c4fd32a928cfb5270f7' 
  AND token = 'VlrW4VLTULYKegbMK6uiEiQNBoip7vIQ59Gs8NznAvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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