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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8faa612900304fd602527397fca3d5f37908c835b35ca3971dd685b98ce97679' 
  AND token = 'KjmW8/I/SW/injgbAp9Ezpo9m0Atv1X+uXQrrn+o7yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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