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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3af3ce5bd5b639b10601d8cf1777f081b4f06083f8de0436b35d9fd634597612' 
  AND token = 'Btyke8hiAZsHTy/H6dqhgO+x3HkjxI5Cns7LcdNRo3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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