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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6b0d3a96169cc05aed988694577d31686741c8e76715e3e75d9fb8e75266f53' 
  AND token = '7j52Ztajv1/9BJih0uZpEyz4/WtTvSKtUd29vEBALIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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