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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d79138c7f40009d35fa83c7eaacd466e7549aaa532d11909f10b629af1d8f2a' 
  AND token = 'BpUVWHWgbya0pjwk6fI+eL+Eeo9ExufBd7l9t8dkjcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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