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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11d659f2bd55501ebec07655c838777438e01f4373686e40a9f5d89d95058f1d' 
  AND token = 'Jt3lGFSmo/Ebd9aD6kxFJeTjskDDHVczjJFoHal25nQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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