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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44757cda74fdf11c5288e885c6f178af56968f41ef99a4e2384318065dec93f9' 
  AND token = 'Yb0cuq9NWkB9R1EffQew7EJlOwTl7bd+zrvQbed4J9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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