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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1b355acabec7185fc3a33b0b3105dc032f4bd7cebe597a728b36c37d5a55475' 
  AND token = 'qsB/xmw2nFc3IvEfludunfQ1LkoD/FkXiKpjMiZHK/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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