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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0d8b9941d83a6e067e44e3182d985f7eb4a49a3c39da58536d25e6983584eaf' 
  AND token = 'Xbu5faY6jG9aFyFT4V9T7ypnZ28Q6XelejtjI5AWvXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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