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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b9f379892c53521439cc258ec56d8cc11cb0083e8fc90000089fd17e283ad94' 
  AND token = 'T+9cQYyjb67cUR2WzTpaRlmqRg/xQwEeLCzWi9b5x+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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