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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1383745890b8976befdd0e977c745fcdbf4f9fc13f48a4af4a870a5a5477aca' 
  AND token = '0VQY6/3poyKYEXTr4Vn0capKzUdC4F3r6wtMtwL6qYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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