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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7361f547ea687755e5acf747fadc13e9da98d34d6cae8ec6c26e020d3e9063f5' 
  AND token = 'NJq3uVWL3Evwh5PyCybwPLlQl2584Gl7IoD2i44+Jhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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