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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc2b3f8e7e239a9a5266bcc9ee1ba8fbf4fa3ea564743cf824bf26b9b4db1c32' 
  AND token = 'UDMtTDK7/V2BsWbVHsrXvfT8cGc8m4nCHuOkja8KtPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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