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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30a25f8092cbd1dff4043b96412120274c4e93646818eff28828496f3b9617a0' 
  AND token = 'C2dKIuba4TjMWvPDW4VhtGp7raqGxWyxkcu7eBW1jO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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