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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b257448286fbfeda93635ef8ec790a99a66ec3a0596c5bf1b2fd0accd488b5fb' 
  AND token = 'SNPYFW3XuxjEjfvTSQ6ijv4LGzkXDWRGXaJr/dnkoE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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