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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8241ab1210a35b4c92a85cc2c9027d215f0a27fae0978b70763100954a986f90' 
  AND token = 'CIjt7gjGfY0zjtbSI7wbMYTbadtrDgApS5EsDT+h/bQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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