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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '392972cd8cfc4794af7df4a5c1b4671b7672c1e4d8048d1115c800699ad3c617' 
  AND token = '1/w0KyBTKJca5Py2Gq3Qz/N7yUOkk1C/HzEO8nPHkkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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