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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcabbf3839203fe9bc351e15ddef1c7bd5e5209fbd9586e3cc255dcaa05a942b' 
  AND token = 'WZHKEDbMWVm056FG1SN//zIbrU5jFZ8FPlyQvyj5u48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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